v2.0.0

Added

• New deep_update/3 function
• New deep_update_with/3 function

Changed

• The {badvalue, P} exception from deep_put/3 now returns a path to the bad
  value instead of the value itself to make it coherent with the new
  deep_update/3 implementation.
• The {badkey, K} exception from deep_get/2 has been changed to
  {badvalue, P} to make it coherent with deep_put/3 and others.